44 F.2d 306 (6th Cir. 1930), 5559, Seymour v. Ford Motor Co.

Docket Nº:5559.
Citation:44 F.2d 306, 7 U.S.P.Q. 182
Case Date:November 05, 1930
Court:United States Courts of Appeals, Court of Appeals for the Sixth Circuit

Page 306

44 F.2d 306 (6th Cir. 1930)

7 U.S.P.Q. 182




No. 5559.

United States Court of Appeals, Sixth Circuit.

November 5, 1930

Joseph H. Milans, of Washington, D.C. (William J. Belknap, Clarence B. Zewadski,

Page 307

and Whittemore, Hulbert, Whittemore & Belknap, all of Detroit, Mich., on the brief), for appellant.

F. L. Chappell, of Kalamazoo, Mich. (Charles R. Halbert, of Detroit, Mich., I. Joseph Farley, of New York City, and Longley & Middleton, of Detroit, Mich., on the brief), for appellee.

Before DENISON, HICKS, and HICKENLOOPER, Circuit Judges.

HICKENLOOPER, Circuit Judge.

Appellant brought his action in the District Court for infringement of patent No. 1,277,652, for a gearing, issued September 3, 1918, to Seymour, upon division of a prior application filed September 9, 1913. The court below dismissed the bill of complaint 'for want of equity,' after rendering an opinion to the effect that the patent in suit involved only variation in degree from the prior art, that the disclosures had not advanced the art, and that the defendant's construction more closely approximated the prior art than that disclosed by the plaintiff. The opinion was rendered in response to defenses asserted by the appellee. The first ground for the dismissal of the plaintiff's bill we construe as a finding of want of invention or patentable novelty; the second suggests lack of utility; and the third savors of lack of infringement, although it is not expressly held that the claims have not been infringed, if they are to be held valid.

The patent relates to gear wheels, one of which is driven by the other, and which are adapted and used to be moved into, or withdrawn from, intermeshing relationship with each other. The purpose is to so construct the ends of the teeth of the gears that they may be shifted into interlocking relationship without tendency to chatter, without flat surfaces of the co-acting teeth coming into contact with each other, and so that only narrow edges of sliding contact are provided. The means for accomplishing this result, and for avoiding flat surface contacts of relatively substantial area, is to cut or bevel the flat end surfaces of the gear teeth, at different or variant angles. Claims 1 and 2 broadly define the invention, and are printed in the margin. 1

It had long been known in the prior art that an intermeshing of such gears would be greatly facilitated by this bevel or chamfer of the ends of the teeth, so that the axial motion of the tooth may start before the teeth reach the circumferential point of final engagement, and so that a substantial portion of the tooth of the driven gear may oppose an equally substantial portion of the driving gear at the moment of initial contact. Common practice was, however, to have the angles of bevel equal, as is shown in the French patent to Lefer, January 2, 1902, No. 317-502. In the United States patent to May, No. 309,236, December 16, 1884, the ends of the teeth are beveled upon both sides, so as to assist in meshing when the driving gear is rotating in either direction, thus making the ends relatively pointed, or curving to a point. Another form is shown in United States patent to Chard, No. 744,678, November 17, 1903, in which the teeth are beveled upon both sides on straight lines; the co-acting teeth of the two gears being beveled at the same angles...

To continue reading